Ubuntu is a really popular OS, which uses the Linux kernel. Though it is used mainly on desktop machines, its server version has been rising in popularity these days as well. Ubuntu is among the lightest Linux distributions available and it's compatible with almost any hardware, which makes it a universal Operating System. It is also very stable and secure and has an a minimum of a five-year support life cycle, so you can get official security and performance updates. Unlike a number of other OS's, Ubuntu is distributed without any license fees and you will be able to modify its core, and / or all of the numerous packages it comes with, in any way you find fit. This will enable you to install the proper software environment for your web applications regardless of their requirements. Due to the popularity of the Operating System, Ubuntu has large developer and user communities, so that you will always find numerous materials on the Internet about any question or problem that you might have.